EP2913868B1 - Secondary battery and method of manufacturing the same - Google Patents
Secondary battery and method of manufacturing the same Download PDFInfo
- Publication number
- EP2913868B1 EP2913868B1 EP14199063.0A EP14199063A EP2913868B1 EP 2913868 B1 EP2913868 B1 EP 2913868B1 EP 14199063 A EP14199063 A EP 14199063A EP 2913868 B1 EP2913868 B1 EP 2913868B1
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- European Patent Office
- Prior art keywords
- terminal
- plate
- electrode
- insertion part
- hole
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title description 2
- 238000003780 insertion Methods 0.000 claims description 61
- 230000037431 insertion Effects 0.000 claims description 61
- 238000009413 insulation Methods 0.000 claims description 26
- 239000008151 electrolyte solution Substances 0.000 claims description 6
- 238000009987 spinning Methods 0.000 description 11
- 239000003792 electrolyte Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000012777 electrically insulating material Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the secondary battery 100 includes an electrode assembly 110, a case 120, a cap assembly 130 and an insulation case 180.
- the terminal plate 160 may be formed of a metal plate configured such that its top surface 160a makes close contact with a bottom surface of the insulation plate 150.
- a bottom surface 160b of the terminal plate 160 faces a top surface of the insulation case 180.
- the top surface 160a of the terminal plate 160 can have, for example, a smaller area than the bottom surface of the insulation plate 150.
- the terminal plate 160 is electrically isolated from the cap plate 140 by the insulation plate 150.
- the bottom surface 160b of the terminal plate 160 can be welded to the second electrode tab 115 of the electrode assembly 110 having passed through the insulation case 180, so that the terminal plate 160 and the electrode assembly 110 have the same polarity.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Description
- The invention generally relates to a secondary battery.
- Rechargeable, or secondary, batteries can be charged and discharged in contrast to primary batteries which cannot be recharged. Small secondary batteries are widely used in advanced electronic equipment, e.g., portable phones, and camcorders. Large secondary batteries are widely used for applications such as driving the motors of electric or hybrid cars. The standard secondary battery includes an electrode assembly housed within a case. An electrode terminal is connected through a collector plate and welded to the electrode assembly.
- Secondary batteries are manufactured to have various shapes such as cylindrical and prismatic shapes. A secondary battery is typically constructed as follows: an electrode assembly is formed by interposing an insulating separator between a positive electrode plate and a negative electrode plate, the electrode assembly is placed in a case together with an electrolyte, and a cap assembly including electrode terminals is attached to the case.
- The cap assembly usually includes a cap plate and a terminal plate each having a terminal through hole and an electrode terminal inserted in the terminal through holes of the cap plate and the terminal plate. An outer periphery of the electrode terminal is wrapped by a gasket.
- In such a cylindrical battery, a top portion of the electrode terminal is rotated and pressed by spinning equipment such as a motor to be fitted into a terminal through hole to be fastened to a terminal plate. However, as the result of the spinning and pressing, the electrode terminal can become tapered so that the contact area between the electrode terminal and the terminal plate is reduced. This increases the resistance between the electrode terminal and the terminal plate, resulting in chronic failures of manufactured secondary batteries.
- In addition, as the contact area between the electrode terminal and the terminal plate decreases, the fastening force between the electrode terminal and the terminal plate may be weakened, loosening the terminal plate such that it freely rotates.
US2007/154802 andJP 2009 087729 A - The present ivnention seeks to provide a secondary battery which can reduce contact resistance of an electrode terminal while reducing manufacturing failures.
- Accordingly, the invention provides a secondary battery as described in the claims.
- Aspects and/or advantages of the described technology will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the described technology.
-
-
FIG. 1 is an exploded perspective of a secondary battery according to an embodiment of the invention. -
FIG. 2 is a cross-sectional view illustrating an electrode terminal of the secondary battery shown inFIG. 1 not according to the invention. -
FIG. 3A is a perspective view illustrating the terminal plate of the secondary battery shown inFIG. 1 ,FIG. 3B is a bottom view of the terminal plate shown inFIG. 3A, and FIG. 3C is a cross-sectional view taken along the line A-A' ofFIG. 3A . -
FIG. 4 is a cross-sectional view of the secondary battery shown inFIG. 1 . -
FIG. 5 is an enlarged view of a portion 'B' shown inFIG. 4 . - Hereinafter, examples of embodiments of the invention will be described in detail with reference to the accompanying drawings such that they can easily be made and used by those skilled in the art.
- Referring to
FIGS. 1 to 5 , thesecondary battery 100 includes anelectrode assembly 110, acase 120, acap assembly 130 and aninsulation case 180. - The
electrode assembly 110 includes apositive electrode plate 111, anegative electrode plate 112, and aseparator 113 interposed between the positive andnegative electrode plates positive electrode plate 111, thenegative electrode plate 112 and theseparator 113 are wound to have a jelly roll structure. - In more detail, the
electrode assembly 110 includes thepositive electrode plate 111 coated with a positive electrode active material, thenegative electrode plate 112 coated with a negative electrode active material, and theseparator 113 positioned between thepositive electrode plate 111 and thenegative electrode plate 112 to prevent an electric short therebetween while allowing lithium ions to move. Here, thepositive electrode plate 111 may include an aluminum (Al) foil, thenegative electrode plate 112 may include a copper (Cu) foil, and theseparator 113 may include polyethylene (PE) or polypropylene (PP). However, the described technology is not limited thereto. In addition, afirst electrode tab 114 protrudes upward by a predetermined length and is electrically connected to thepositive electrode plate 111. Asecond electrode tab 115 protrudes upward by a predetermined length and is electrically connected to thenegative electrode plate 112. Thefirst electrode tab 114 may include aluminum (Al), and thesecond electrode tab 115 may include nickel (Ni), but the described technology is not limited thereto. In addition, the polarities of the first andsecond electrode tabs - The
case 120 has atop opening 120a having an open top portion and is shaped like a substantially rectangular parallelepiped. That is to say, thecase 120 has a pair of long side portions 121 spaced a predetermined distance apart from each other and having relatively large areas, a pair of short side portions 122 having smaller areas than the pair of long side portions 121, and a bottom portion 123 formed on a bottom of the long side portions 121 and the short side portions 122 to be substantially perpendicular to the long side portions 121 and the short side portions 122. - The
case 120 can be formed by a deep drawing method so that the long side portions 121, the short side portions 122 and the bottom portion 123 are integrally formed. Here, thecase 120 may be formed of one material selected from the group of steel, aluminum and equivalents thereof, but is not limited thereto. - An electrolytic solution (not shown) and the
electrode assembly 110 are accommodated or housed in thecase 120. The electrolyte may serves as a movement medium for lithium ions generated by electrochemical reactions occurring in the positive andnegative electrode plates secondary battery 100. The electrolytic solution may be a non-aqueous organic electrolyte including a lithium salt and a high-purity organic solvent mixed therein. In addition, the electrolyte may be a polymer using a polymeric electrolyte. - The
cap assembly 130 includes acap plate 140, aninsulation plate 150, aterminal plate 160 and anelectrode terminal 170. Thecap assembly 130 is connected to aseparate insulation case 180 and is attached to thetop opening 120a of thecase 120 to seal thecase 120. - The
cap plate 140 is formed of a metal plate sized and shaped to correspond to thetop opening 120a of thecan 120. Thefirst electrode tab 114 of theelectrode assembly 110 passes through theinsulation case 180 and can be welded to a bottom surface of thecap plate 140. Thus, thecap plate 140 has the same polarity as thefirst electrode tab 114 of theelectrode assembly 110. - A terminal through hole or cap through
hole 141 is formed between top and bottom surfaces of thecap plate 140 and is substantially centrally located within thecap plate 140. Anelectrode terminal 170 is inserted into the terminal throughhole 141 and connected to the terminal throughhole 141. Atubular gasket 143 is mounted on an inner surface of the terminal throughhole 141 to electrically insulate theelectrode terminal 170 from the cap plate 131. Thegasket 143 is interposed between the terminal throughhole 141 and theelectrode terminal 170, makes close contact therewith and electrically isolates theelectrode terminal 170 and thecap plate 140 from each other. Thus, the terminal throughhole 141 of thecap plate 140 may be sized to correspond to the outer diameter of thegasket 143. - An
electrolyte injection hole 142 may further be provided at one side of thecap plate 140. Theelectrolyte injection hole 142 enables the injection of an electrolytic solution into an inner space of thecase 120 after thecap assembly 130 is assembled with thetop opening 120a of thecase 120. In addition, theelectrolyte injection hole 142 is sealed by aplug 144 after the electrolytic solution is injected into thecase 120. - The
insulation plate 150 can be formed of an electrically insulating material and is interposed between thecap plate 140 and theterminal plate 160 to electrically insulate thecap plate 140 and theterminal plate 160 from each other. Theinsulation plate 150 has a terminal through hole or insulation throughhole 151 located to correspond to the terminal throughhole 141 of thecap plate 140 to allow theelectrode terminal 170 to be inserted into the terminal throughhole 151. Theelectrode terminal 170 is inserted into the terminal throughhole 151 of theinsulation plate 150 and is connected to theinsulation plate 150. Agasket 143 may further be provided between the terminal throughhole 151 of theinsulation plate 150 and theelectrode terminal 170. In addition, the terminal throughhole 151 of theinsulation plate 150 may be sized to correspond to an outer diameter of thegasket 143. That is to say, the terminal throughhole 151 of theinsulation plate 150 may be sized to correspond to the terminal throughhole 141 of thecap plate 140. - The
terminal plate 160 may be formed of a metal plate configured such that itstop surface 160a makes close contact with a bottom surface of theinsulation plate 150. Abottom surface 160b of theterminal plate 160 faces a top surface of theinsulation case 180. Thus, theterminal plate 160 is interposed between theinsulation plate 150 and theinsulation case 180. Thetop surface 160a of theterminal plate 160 can have, for example, a smaller area than the bottom surface of theinsulation plate 150. Theterminal plate 160 is electrically isolated from thecap plate 140 by theinsulation plate 150. Thebottom surface 160b of theterminal plate 160 can be welded to thesecond electrode tab 115 of theelectrode assembly 110 having passed through theinsulation case 180, so that theterminal plate 160 and theelectrode assembly 110 have the same polarity. - The
terminal plate 160 has a terminal throughhole 161 formed between thetop surface 160a and thebottom surface 160b and theelectrode terminal 170 is inserted into the terminal throughhole 161 and electrically connected to the terminal throughhole 161. The terminal throughhole 161 of theterminal plate 160 is located to correspond to the terminal throughhole 141 of thecap plate 140. - The terminal through
hole 161 includes a first terminal through hole orupper section 161a extending from thetop surface 160a toward thebottom surface 160b of theterminal plate 160 and a second terminal through hole orlower section 161b extending from thebottom surface 160b toward thetop surface 160a of theterminal plate 160. The first terminal throughhole 161a has a first inner diameter (a), the second terminal throughhole 161b has a second inner diameter b, and the first inner diameter a is less than the second inner diameter b. Thus, the first terminal throughhole 161a formed on thetop surface 160a of theterminal plate 160 and the second terminal throughhole 161b formed on thebottom surface 160b of theterminal plate 160 have different shapes and/or sizes. - In addition, the central axes of the first and second terminal through
holes holes hole 161 formed at least one step due to the difference in diameter between the first and second terminal throughholes - A lower region of the
electrode terminal 170 passes through the first terminal throughhole 161a of theterminal plate 160 and makes close contact with theterminal plate 160 through the bottom surface of the second terminal throughhole 161b. Accordingly, theterminal plate 160 is electrically connected to theelectrode terminal 170. - In order to make contact with an outer circumferential surface of the
electrode terminal 170, the first terminal throughhole 161a may be a circular hole having substantially the same shape as the body of theelectrode terminal 170. The second terminal throughhole 161b may have substantially the same circular shape with the first terminal throughhole 161a. Alternatively, the second terminal throughhole 161b may have a substantially polygonal shape, such as that of a rectangle. - The
electrode terminal 170 is inserted into terminal throughholes cap plate 140, theinsulation plate 150 and theterminal plate 160 to pass through the terminal throughholes electrode terminal 170 may be formed of a metal plate having a substantially cylindrical shape. - The
electrode terminal 170 includes ahead part 171 and anextension part 172 each horizontally extending a predetermined length from a top surface of thecap plate 140. Theelectrode terminal 170 also includes a first insertion part orbody 173 and a second insertion part ortail 174 each having a substantially cylindrical shape and inserted into the terminal throughholes cap plate 140, theinsulation plate 150 and theterminal plate 160. Thehead part 171 and theextension part 172 of theelectrode terminal 170 are electrically isolated from the top surface of thecap plate 140 by thegasket 143. Theelectrode terminal 170 is inserted into the terminal throughhole 161 of theterminal plate 160 to make contact with theterminal plate 160, so that theelectrode terminal 170 has the same polarity as thesecond electrode tab 115 electrically connected to theterminal plate 160. - The
head part 171 horizontally extends. In addition, theplate part 171 is a region exposed to the outside of thesecondary battery 100 and functions as an electrode having the same polarity with thesecond electrode tab 115 in a final structure. - The
extension part 172 is formed to be substantially parallel to thehead part 171 and may have a length that is less than that of thehead part 171. Theextension part 172 can efficiently prevent moisture from penetrating into thesecondary battery 100 and the electrolytic solution from leaking out of thesecondary battery 100 by increasing the contact area between theextension part 172 and thegasket 143. - The
first insertion part 173 has a substantially cylindrical shape and protrudes downward from theextension part 172. Thefirst insertion part 173 is formed to have a first length h1 and afirst thickness 11 and passes through the terminal throughhole 141 of thecap plate 140 and the terminal throughhole 151 of theinsulation plate 150. In addition, since the exterior surface of thefirst insertion part 173 is wrapped by thegasket 143, thecap plate 140 and thefirst electrode tab 114 are electrically insulated from each other. - The
first insertion part 173 is formed such that its bottom end is rounded having a first curvature radius r1. Here, the first curvature radius r1 may be about 0.01 mm or greater. When the first curvature radius r1 is about 0.01 mm, it is possible to prevent cracks from being generated in theterminal plate 160 when thefirst insertion part 173 is inserted into the terminal through hole of theterminal plate 160 by spinning. However, an upper limit of the first curvature radius r1 is not specifically preset because it is advantageous to set the first curvature radius r1 to be larger in order to prevent cracks from being generated. However, in other embodiments, the first curvature radius r1 is less than about 0.01 mm. - The
second insertion part 174 has a substantially cylindrical shape and extends from a bottom end of thefirst insertion part 172. Thesecond insertion part 174 is formed to have substantially the same center as thefirst insertion part 174 so as to facilitate insertion of theelectrode terminal 170 by spinning. Thesecond insertion part 174 has a second length h2 and asecond thickness 12. - Here, the second length h2 of the
second insertion part 174 extending from the end of thesecond insertion part 174 connected to thefirst insertion part 173 may be about 0.1 mm or greater. When the second length h2 of thesecond insertion part 174 is greater than or equal to about 0.1 mm, thesecond insertion part 174 may spread out by being rotated in a spinning process for being connected to theterminal plate 160. Accordingly, thesecond insertion part 174 can be deformed such that it makes contact with the second terminal throughhole 161b having the second inner diameter b. In addition, contact resistance between thesecond insertion part 174 and theterminal plate 160 can be reduced by increasing the contact area between the deformedsecond insertion part 174 and the second terminal throughhole 161b of theterminal plate 160. However, the upper limit of the second length h2 is not specifically preset because it is advantageous to set the second length h2 of thesecond insertion part 174 to be greater in order to reduce the contact resistance. However, in other embodiments, the second length h2 may be less than about 0.1 mm. - The
second thickness 12 of thesecond insertion part 174 is less than thefirst thickness 11 of thefirst insertion part 173. Here, thesecond thickness 12 may be greater than or equal to about 0.05 mm. When thefirst insertion part 173 has various thicknesses, thesecond insertion part 174 may have an area set to be greater than or equal to about 20% of the area of thefirst insertion part 173. Generally, when thesecond thickness 12 is greater than or equal to about 0.05 mm, thesecond insertion part 174 may sufficiently spread out in a spinning process to then make contact with the second terminal throughhole 161b having the second inner diameter b. In addition, if the area of thesecond insertion part 174 is greater than or equal to about 20% of the area of thefirst insertion part 173, thesecond insertion part 174 may sufficiently spread out in the spinning process. However, in other embodiments, thesecond thickness 12 is less than about 0.05 mm and the area of thesecond insertion part 174 is less than about 20% of the area of thefirst insertion part 173. - In addition, the
second thickness 12 of thesecond insertion part 174 may be about half (1/2) or less of thefirst thickness 11 of thefirst insertion part 173. In addition, when thesecond thickness 12 of thesecond insertion part 174 is less than or substantially equal to about half of thefirst thickness 11 of thefirst insertion part 173, a sufficiently low contact resistance between thesecond insertion part 174 and theterminal plate 160 can be obtained. However, in other embodiments, thesecond thickness 12 is greater than about half of thefirst thickness 11. - In addition, the bottom end of the
second insertion part 174 may be rounded to have a second curvature radius r2. The bottom end of thesecond insertion part 174 can prevent theterminal plate 160 from being damaged in the spinning process. To this end, the second curvature radius r2 may be about 0.01 mm or greater. If the second curvature radius r2 is greater than or equal to about 0.01 mm, theterminal plate 160 can be prevented from being damaged. Accordingly, the upper limit of the second curvature radius r2 is not specifically preset. However, in other embodiments, the second curvature radius r2 is less than about 0.01 mm. - Referring to
FIGS. 4 and 5 , the bottom of thesecond insertion part 174 is deformed by spinning to be connected to the bottom surface of theterminal plate 160. If thesecond insertion part 174 spreads out by spinning, it is connected to the bottom surface of theterminal plate 160. In particular, thesecond insertion part 174 spreads out along the second terminal throughhole 161b of theterminal plate 160 to be connected to theterminal plate 160. Therefore, the bottom end of thesecond insertion part 174 is electrically connected to theterminal plate 160. Here, thelength 13 of thesecond insertion part 174 that is deformed and spread out is less than or substantially equal to the inner diameter of the second terminal throughhole 161b. Therefore, the bottom end of thesecond insertion part 174 may be stably connected to the second terminal throughhole 161b. In one embodiment, the spinning of the electrode terminal is performed by a motor (not illustrated) at a speed that enables the material of the electrode terminal to be spread out. - Further, as shown in
FIG. 5 , after thesecond insertion part 174 is spread out it includes upper and lower ends 174 and 175 having different thicknesses. Theupper end 174 has thesecond thickness 12 that substantially equals the first inner diameter a of the first terminal throughhole 161a. Thelower end 175 has the third thickness orlength 13 that is less than or substantially equal to the second inner diameter b. - As can be seen in
FIG. 5 , thesecond insertion part 174 has a second thickness (a) less than a first thickness offirst insertion part 173. Andlower end 175 has a thickness (b) bigger than the second thickness (a). Thus, theterminal plate 160 can be fixed between thefirst insertion part 173 and thelower end 175 around thesecond insertion part 174 easily and stably, and damage to theterminal plate 160 can be reduced. - The
insulation case 180 is formed of an electrically insulating material and is interposed between thecap assembly 130 and theelectrode assembly 110 to electrically insulate thecap assembly 130 and theelectrode assembly 110 from each other. In addition, theinsulation case 180 includes a pair of tab holes to allow thefirst electrode tab 114 and thesecond electrode tab 115 of thecap assembly 130 to upwardly protrude therethrough. Thus, theinsulation case 180 electrically insulates a top end ofelectrode assembly 110, from which thefirst electrode tab 114 and thesecond electrode tab 115 of theelectrode assembly 110 protrude, and thecap assembly 130 from each other. - Although embodiments of the inventive technology have been described in detail hereinabove, it should be understood that many variations and modifications of the described inventive technology, which may be apparent to those skilled in the art, will still fall within the scope of the present invention as defined by the appended claims.
Claims (10)
- A secondary battery (100), comprising:an electrode assembly (110) including a first electrode plate (111), a second electrode plate (112) and a separator (113);a case (180) having an opening and housing the electrode assembly (110) and an electrolytic solution; anda cap assembly (130) including a cap plate (140), an insulation plate (150), a terminal plate (160) and an electrode terminal (170), wherein the cap assembly (130) seals the opening,wherein the electrode terminal (170) is electrically connected to the terminal plate (160) and includes a head part (171), a first insertion part (173) having a first thickness and a second insertion part (174) having a second thickness less than the first thickness,wherein the second insertion part (174) has upper and lower ends, wherein the upper end has the second thickness and wherein the lower end has a third thickness greater than the second thickness.
- A secondary battery (100) according to claim 1, wherein the upper end of the second insertion part (174) of the electrode terminal (170) has an area that is greater than or equal to about 20% of the area of the body of the electrode terminal (170).
- A secondary battery (100) according to claim 1 or 2, wherein the first insertion part (173) of the electrode terminal (170) has a first length, wherein the second insertion part (174) of the electrode terminal (170) has a second length and wherein the second length is less than the first length.
- A secondary battery (100) according to claim 3, wherein the second length is greater than or equal to about 0.05 mm.
- A secondary battery (100) of claim 3 or 4, wherein the second length is less than or equal to about half of the first length.
- A secondary battery (100) according to any preceding claim, wherein the first insertion part (173) of the electrode terminal (170) is connected to the second insertion part (174) of the electrode terminal (170) at a junction having a rounded edge and wherein the rounded edge of the junction has a first curvature radius.
- A secondary battery (100) according to claim 6, wherein the first curvature radius is greater than or equal to about 0.1 mm.
- A secondary battery (100) according to any preceding claim, wherein the terminal plate (160) has a terminal through hole extending from a top surface to a bottom surface thereof, wherein the electrode terminal is inserted into the terminal through hole, and wherein the terminal through hole has a first diameter at the top surface of the terminal plate (160) and a second diameter at the bottom surface of the terminal plate (160).
- A secondary battery (100) according to claim 8, wherein the second diameter is greater than the first diameter.
- A secondary battery according to claim 8 or 9, wherein the second insertion part (174) of the electrode terminal (170) is connected to the terminal plate (160) and wherein the second insertion part (174) of the electrode terminal (170) at least partially fills the portion of the terminal through hole having the second diameter.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020140023695A KR102154332B1 (en) | 2014-02-27 | 2014-02-27 | Secondary Battery |
Publications (2)
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EP2913868A1 EP2913868A1 (en) | 2015-09-02 |
EP2913868B1 true EP2913868B1 (en) | 2018-05-02 |
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EP14199063.0A Active EP2913868B1 (en) | 2014-02-27 | 2014-12-18 | Secondary battery and method of manufacturing the same |
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US (1) | US10388936B2 (en) |
EP (1) | EP2913868B1 (en) |
JP (1) | JP6647775B2 (en) |
KR (1) | KR102154332B1 (en) |
CN (1) | CN104882626B (en) |
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KR20150101863A (en) * | 2014-02-27 | 2015-09-04 | 삼성에스디아이 주식회사 | Rechargeable battery |
KR20150101864A (en) * | 2014-02-27 | 2015-09-04 | 삼성에스디아이 주식회사 | Secondary battery |
US10333132B2 (en) * | 2015-03-23 | 2019-06-25 | Sanyo Electric Co., Ltd. | Power source device including terminal fixing part and deformable buffer portion |
JP6731176B2 (en) | 2016-01-21 | 2020-07-29 | 株式会社Gsユアサ | Electric storage element and method for manufacturing electric storage element |
JP6852629B2 (en) * | 2017-09-12 | 2021-03-31 | トヨタ自動車株式会社 | Power storage device |
JP7245208B2 (en) | 2020-09-17 | 2023-03-23 | プライムプラネットエナジー&ソリューションズ株式会社 | SECONDARY BATTERY TERMINAL AND SECONDARY BATTERY INCLUDING THE TERMINAL |
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GB0403109D0 (en) * | 2004-02-12 | 2004-03-17 | Hesco Bastion Ltd | Apparatus for the creation of outer surfaces for structures |
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- 2014-07-23 JP JP2014149555A patent/JP6647775B2/en active Active
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- 2014-12-18 EP EP14199063.0A patent/EP2913868B1/en active Active
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Also Published As
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---|---|
US10388936B2 (en) | 2019-08-20 |
JP6647775B2 (en) | 2020-02-14 |
KR102154332B1 (en) | 2020-09-09 |
KR20150101862A (en) | 2015-09-04 |
US20150243955A1 (en) | 2015-08-27 |
CN104882626B (en) | 2020-02-14 |
EP2913868A1 (en) | 2015-09-02 |
CN104882626A (en) | 2015-09-02 |
JP2015162460A (en) | 2015-09-07 |
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